package com.authority.security.handler;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.serializer.SerializerFeature;
import com.authority.entity.User;
import com.authority.utils.JwtUtils;
import com.authority.utils.LoginResult;
import com.authority.utils.RedisUtils;
import com.authority.utils.ResultCode;
import io.jsonwebtoken.Jwts;
import org.springframework.security.core.Authentication;
import org.springframework.security.web.authentication.AuthenticationSuccessHandler;
import org.springframework.stereotype.Component;

import javax.annotation.Resource;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.nio.charset.StandardCharsets;

/**
 * 登录认证成功处理器类
 */
@Component
public class LoginSuccessHandler implements AuthenticationSuccessHandler {
    @Resource
    JwtUtils jwtUtils;
    @Resource
    RedisUtils redisUtils;
    @Override
    public void onAuthenticationSuccess(HttpServletRequest request, HttpServletResponse response, Authentication authentication) throws IOException, ServletException {
        //设置响应的编码格式
        response.setContentType("application/json;charset=utf-8");
        //获取当前登录用户信息
        User user=(User)authentication.getPrincipal();
        //生成token
        String token = jwtUtils.generateToken(user);
        //设置token的签名密钥以及过期时间
        long expireTime=Jwts.parser()
                .setSigningKey(jwtUtils.getSecret())       //设置签名密钥
                .parseClaimsJws(token.replace("jwt",""))
                .getBody().getExpiration().getTime();      //设置过期时间
        //创建LoginResult登录结果对象
        LoginResult loginResult=new LoginResult(user.getId(), ResultCode.SUCCESS,token,expireTime);
        //将对象转成JSON格式，并消除循环依赖
        String result = JSON.toJSONString(loginResult, SerializerFeature.DisableCircularReferenceDetect);
        //获取输出流
        ServletOutputStream outputStream = response.getOutputStream();
        outputStream.write(result.getBytes(StandardCharsets.UTF_8));
        outputStream.flush();
        outputStream.close();
        //将token信息保存到redis中
        String tokenKey="token_"+token;
        redisUtils.set(tokenKey,token,jwtUtils.getExpiration()/1000);
    }
}
